It was a bit too scary for my 4 year old and we left early. I really didn't appreciate the part with the dentist coming at the guy with that HUGE scary needle. That scene was going back and forth with the scene where Horton was trying to cross the bridge or "fall to his death" as he put it. Yeah, I think that combination was what made ds say he wanted to go home. We stuck it out a bit hoping for a happy resolution, but when the kangaroo hired the scary vulture, I thought we better get out of there before it gets worse.
Hopefully he will forget about that huge needle by his next dental checkup!